m=1<<20;main(n){char a[m];for(n=0;read(0,a+n,1)&&a[n++]-10;);sscanf(a,"%d%d",&n,&n);for(--n;n-=read(0,a,n>m?m:n););for(;read(0,a,m);write(1,a,m));}
